Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation and Significant Accounting Policies Offsetting Assets and Liabilities (Details)

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Basis of Presentation and Significant Accounting Policies Offsetting Assets and Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Derivative Financial Instruments, Assets [Member]
    
Offsetting Assets and Liabilities [Line Items]    
Gross Amount of Recognized Assets (Liabilities) $ 370,906 $ 572,050
Gross Amounts Offset on the Balance Sheet (17,013) (22,191)
Net Amount of Assets (Liabilities) Presented on the Balance Sheet 353,893 549,859
Gross Amounts of Financial Instruments Not Offset on the Balance Sheet (4,221) (22,081)
Gross Amounts of Cash Collateral Not Offset on the Balance Sheet 0 0
Net Amount After Deducting Gross Amounts Not Offset on the Balance Sheet From Net Amount of Assets (Liabilities) Presented on the Balance Sheet 349,672 527,778
Assets [Member]
    
Offsetting Assets and Liabilities [Line Items]    
Gross Amount of Recognized Assets (Liabilities) 370,906 572,050
Gross Amounts Offset on the Balance Sheet (17,013) (22,191)
Net Amount of Assets (Liabilities) Presented on the Balance Sheet 353,893 549,859
Gross Amounts of Financial Instruments Not Offset on the Balance Sheet (4,221) (22,081)
Gross Amounts of Cash Collateral Not Offset on the Balance Sheet 0 0
Net Amount After Deducting Gross Amounts Not Offset on the Balance Sheet From Net Amount of Assets (Liabilities) Presented on the Balance Sheet 349,672 527,778
Federal Funds Purchased and Securities Sold under Agreements to Repurchase [Member]
    
Offsetting Assets and Liabilities [Line Items]    
Gross Amount of Recognized Assets (Liabilities) (12,274,878) (12,250,450)
Gross Amounts Offset on the Balance Sheet 0 0
Net Amount of Assets (Liabilities) Presented on the Balance Sheet (12,274,878) (12,250,450)
Gross Amounts of Financial Instruments Not Offset on the Balance Sheet 12,274,878 12,250,450
Gross Amounts of Cash Collateral Not Offset on the Balance Sheet 0 0
Net Amount After Deducting Gross Amounts Not Offset on the Balance Sheet From Net Amount of Assets (Liabilities) Presented on the Balance Sheet 0 0
Federal Home Loan Bank Advances [Member]
    
Offsetting Assets and Liabilities [Line Items]    
Gross Amount of Recognized Assets (Liabilities) (1,500,000)  
Gross Amounts Offset on the Balance Sheet 0  
Net Amount of Assets (Liabilities) Presented on the Balance Sheet (1,500,000)  
Gross Amounts of Financial Instruments Not Offset on the Balance Sheet 1,500,000  
Gross Amounts of Cash Collateral Not Offset on the Balance Sheet 0  
Net Amount After Deducting Gross Amounts Not Offset on the Balance Sheet From Net Amount of Assets (Liabilities) Presented on the Balance Sheet 0  
Derivative Financial Instruments, Liabilities [Member]
    
Offsetting Assets and Liabilities [Line Items]    
Gross Amount of Recognized Assets (Liabilities) (21,234) (44,272)
Gross Amounts Offset on the Balance Sheet 17,013 22,191
Net Amount of Assets (Liabilities) Presented on the Balance Sheet (4,221) (22,081)
Gross Amounts of Financial Instruments Not Offset on the Balance Sheet 4,221 22,081
Gross Amounts of Cash Collateral Not Offset on the Balance Sheet 0 0
Net Amount After Deducting Gross Amounts Not Offset on the Balance Sheet From Net Amount of Assets (Liabilities) Presented on the Balance Sheet 0 0
Liability [Member]
    
Offsetting Assets and Liabilities [Line Items]    
Gross Amount of Recognized Assets (Liabilities) (13,796,112) (12,294,722)
Gross Amounts Offset on the Balance Sheet 17,013 22,191
Net Amount of Assets (Liabilities) Presented on the Balance Sheet (13,779,099) (12,272,531)
Gross Amounts of Financial Instruments Not Offset on the Balance Sheet 13,779,099 12,272,531
Gross Amounts of Cash Collateral Not Offset on the Balance Sheet 0 0
Net Amount After Deducting Gross Amounts Not Offset on the Balance Sheet From Net Amount of Assets (Liabilities) Presented on the Balance Sheet $ 0 $ 0